First used in Order of the Phoenix when Neville, Luna and Harry needed to seal doors in the Department of Mysteries against some Death Eaters… The Latin word 'porta' means ‘door' and the Greek root 'kolla' means ‘glue’, (Wikipedia)

When two wands that share the same magical core, such as Harry and Voldemort’s, are forced to engage in battle, a more powerful reverse spell effect called Priori Incantatem takes place. (The Goblet of Fire)